var showornot = 1;
$(document).ready(function(){
	var blocks = $(".moreabstact");
	blocks.click(function(){
			$(this).prev().slideToggle();
			if(showornot == 1){
				$(this).prev().attr("src","./img/shownull.png");
				showornot = 0;
			}else{
				$(this).prev().attr("src","./img/showall.png");
				showornot = 1;
			}
  });
});
